ppo support rm server

src/llmtuner/extras/packages.py

@@ -18,6 +18,7 @@ _flash_attn2_available = is_package_available("flash_attn") and get_package_vers
 _jieba_available = is_package_available("jieba")
 _matplotlib_available = is_package_available("matplotlib")
 _nltk_available = is_package_available("nltk")
+_requests_available = is_package_available("requests")
 _rouge_available = is_package_available("rouge_chinese")
 _starlette_available = is_package_available("sse_starlette")
 _uvicorn_available = is_package_available("uvicorn")
@@ -43,6 +44,10 @@ def is_nltk_available():
     return _nltk_available
 
 
+def is_requests_available():
+    return _requests_available
+
+
 def is_rouge_available():
     return _rouge_available